Sister Lucy of Fatima Describes the Vision of Hell

At Fatima, the Blessed Virgin Mary told the three child
seers that many souls go to hell because they have no one to pray or make
sacrifices for them. In her Memoirs, Sister Lucy describes the vision
of hell that Our Lady showed the children at Fatima:

"She opened Her hands once more, as She had done the
two previous months. The rays [of light] appeared to penetrate the earth, and
we saw, as it were, a vast sea of fire. Plunged in this fire, we saw the demons
and the souls [of the damned]. The latter were like transparent burning embers,
all blackened or burnished bronze, having human forms. They were floating about
in that conflagration, now raised into the air by the flames which issued from
within themselves, together with great clouds of smoke. Now they fell back on
every side like sparks in huge fires, without weight or equilibrium, amid
shrieks and groans of pain and despair, which horrified us and made us tremble
with fright (it must have been this sight which caused me to cry out, as people
say they heard me). The demons were distinguished [from the souls of the
damned] by their terrifying and repellent likeness to frightful and unknown
animals, black and transparent like burning coals. That vision only lasted for
a moment, thanks to our good Heavenly Mother, Who at the first apparition had
promised to take us to Heaven. Without that, I think that we would have died of
terror and fear."